I want to lose 45-50 in 6months. Is this possible?

Im 23 years old. I had my daughter a year and a half, and I just had my twins a month ago. after having my daughter it took me 7 months to lose 25pounds but i didn't follow any dietary schedule and i ate everything. I want to lose about 45 pounds in 6months, on a strict workout and eating schedule. It this possible?